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Except for polling mode, this driver's transfer_one_message() makes use of interrupt handler and tasklet. This is problematic because spi_transfer_delay_exec(), who may sleep, is called in interrupt handler and tasklet. This causes the following warning: BUG: sleeping function called from invalid context at drivers/spi/spi.c:1428 Switch to use the default spi_transfer_one_message() instead, which calls spi_transfer_delay_exec() appropriately. Signed-off-by: Nam Cao <namcao@linutronix.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/ae1940abd6ff6a9e77b4373cff60007c641a0c6c.1701274975.git.namcao@linutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.